Statistics for occurrence #1 of “J. Black” in chapter 1.5 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 7: Prisons and Hospitals.:

...h: J. F. Stone, First Maryland Cavalry; H. C. Florance, First W. Artillery; D. Kilpatrick, First W. Artillery; William Byrne, Cit. Maryland; D. W. Slye, Cit. Maryland; Van Vinson, First W. Artillery; J. Black , Louisiana Guard; F. F. Case, First W. Artillery; G. W. Dupre, First W. Artillery; C. E. Inloes, First Maryland Cavalry; Edwin Harris, Company H., Seventh Louisiana; W. D. DuBarry, Twenty-seventh Sou...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
† J. Black 4 2 0 0 0 user votes
T. J. Blackwell 9 0 1 0 0 user votes
J. Blackstone 6 0 0 0 0 user votes
J. J. Black 4 0 0 0 0 user votes
A. J. Blackburn 4 0 2 0 0 user votes
J. Blackford 4 0 0 0 0 user votes
B. J. Black 2 0 0 0 0 user votes
E. J. Black 2 0 0 0 0 user votes
R. J. Black 2 0 0 0 0 user votes
William J. Black 2 0 0 0 0 user votes
J. Blackman 2 0 0 0 0 user votes
J. J. Blackshear 2 0 0 0 0 user votes
W. J. Black 1 0 1 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.